// This is the session bean (POJO) for the student-oriented web pages
// It is created at the studentWelcome page, and if the user happens
// on another page first, the user is forwarded to that page.
// This bean holds the room number for the user across the various
// page visits, making it (roomNo) a session variable.
package pizza.presentation.web;
import org.apache.commons.logging.LogFactory;
import org.apache.commons.logging.Log;

import java.util.Set;
import java.util.HashSet;
import java.util.List;
import pizza.domain.PizzaOrder;
import pizza.domain.PizzaSize;
import pizza.domain.Topping;

import pizza.service.StudentService;
import pizza.config.PizzaSystemConfig;
import pizza.service.ServiceException;

public class StudentBean {
	private Log log = LogFactory.getLog(getClass()); 
	private StudentService studentService;
	
	// Properties used from student-oriented JSP pages--
	// roomNo is the only real session variable (keeps state between requests in
	// this session bean)  Set by param gen'd on two different pages.
	private int roomNo; 
	
	// size and toppings are set and used by the orderPizza page, based
	// on params generated by the previous orderForm page
	private int sizeId;

	private Set<Integer> toppingIds = new HashSet<Integer>();

	public StudentBean() {
		studentService = PizzaSystemConfig.getStudentService();
	}

	public int getMaxRoomNo() {
		return PizzaSystemConfig.NUM_OF_ROOMS;
	}
	
	public int getRoomNo() {
		return roomNo;
	}

	public void setRoomNo(int roomNo) {
		this.roomNo = roomNo;
	}
	
	// size id comes in a parameter from the order form page. 
	public void setSizeId(int sizeId) {
		this.sizeId = sizeId;
	}

	// topping ids come in one by one from the query string processing
	// after submission of the order form.
	public void setToppingId(int toppingId) {
		toppingIds.add(toppingId);
	}

	// Size, toppings and roomNo are already set from params 
	// coming in to pizzaOrder page, where also this is called--
	public String makeOrder() {
		String result = null;
		try {
			int id = studentService.makeOrder(roomNo, sizeId, toppingIds);
			result = "success, order number is " + id;
		} catch (ServiceException e) {
			result = "failure: "+ PizzaSystemConfig.reportException(log, e);
		}
		toppingIds.clear();
		return result;
	}

	// get status for the current room, i.e., list of orders with status
	public List<PizzaOrder> getStatus() {
		List<PizzaOrder> status = null;
		try {
			status = studentService.getOrderStatus(roomNo);
		} catch (ServiceException e) {
			PizzaSystemConfig.reportException(log, e);
		}
		return status;
	}

	// proxy the calls to get all sizes and all toppings
	// (we could use studentService directly from the .jsp, but that
	// would involve letting exceptions get to the .jsp.
	// It's better to do exception handling in java
	public List<PizzaSize> getAllSizes() {
		try {
			return studentService.getPizzaSizes();
		} catch (ServiceException e) {
			PizzaSystemConfig.reportException(log, e);
			return null;
		}
	}

	public List<Topping> getAllToppings() {
		try {
			return studentService.getToppings();
		} catch (ServiceException e) {
			PizzaSystemConfig.reportException(log, e);
			return null;
		}
	}

}